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Finding the Fourth Proportional to 964.80, 1,340.37 and 955.80

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Solution

The fourth proportional to 964.80, 1,340.37 and 955.80 is: 1,327.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.80 : 1,340.37 = 955.80 : x
  2. Step 2: Convert to fraction form
    964.80/1,340.37 = 955.80/x
  3. Step 3: Cross multiply
    964.80x = 1,340.37 × 955.80
  4. Step 4: Simplify right side
    964.80x = 1,281,125.65
  5. Step 5: Solve for x
    x = 1,281,125.65/964.80
  6. Step 6: Final answer
    x = 1,327.87

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.